Ooh makes sense, sorry!

GrapheneOS

Then I’m just unlucky because it didn’t work for me, no push notifications

I use MicroG on my phone, it’s a basic FOSS replacement for GMS and makes push notifications work for all apps. It gets push notifs from Google’s servers but you don’t need an account. It doesn’t use Google at all for location, which is nice as that’s a highly invasive aspect of Play Services. Not all ROMs are compatible with it, I use it on Lineage

Does it work with WhatsApp? Its the only app that drains my battery like crazy. I had it installed but didn’t work

It depends. Some apps have their push notifications system but may consume more battery.

You should list what apps

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